Internal Red Laser for Glock Full-Size Pistols. The LaserMax LMS-1141P Red Guide Rod Laser is purpose-built for Glock 17, 22, 31, and 37 Gen 1-3 pistols. Engineered for concealed carry, home defense, training, and duty applications, the LMS-1141P installs easily without gunsmithing or permanent firearm modification. The internal guide rod design maintains factory grip ergonomics and does not interfere with most holsters. Constructed with rugged aircraft-grade aluminum components and genuine Wolff springs, the system is built for dependable long-term performance. The high-visibility pulsing red laser improves target awareness and enhances visibility in varying lighting conditions. Positioned close to the bore axis, the laser helps maximize point-of-aim and point-of-impact alignment for improved accuracy. LaserMax also guarantees factory alignment for dependable center-of-mass targeting performance. Glock 17 Gen 1-3. Glock 22 Gen 1-3. Glock 31 Gen 1-3. Glock 37 Gen 1-3. Features of the LaserMax LMS-1141P. Internal red guide rod laser system. Designed for Glock Gen 1-3 full-size pistols. Replaces factory recoil spring guide assembly. Genuine Wolff springs included. Pulsing laser for enhanced visibility. Ambidextrous ON/OFF activation switch. Maintains factory grip and holster compatibility. Close-to-bore alignment for improved POA/POI accuracy. User installable with no gunsmithing required. Also available in green.